This paper presents a novel architecture called the MetaGrid based on Grid computing concepts for resource provisioning for wide-area network-enabled applications. Resource provisioning for wide-area applications can involve coordinated allocation of computing and communication resources. A Grid computing systems provides a virtual framework that facilitates controlled resource sharing among different institutions.The MetaGrid extends the Grid computing systems in two major ways: (a) introduces a notion of SubGrid that provides a coarse-grained resource allocation class and (b) introduces a framework for interconnecting Grids by facilitating peering, trading, and brokering among the different Grids. This paper presents (a) the overall architecture of the MetaGrid with a description of the different functional components, (b) the resource allocation model that is introduced by the notion of SubGrids, and (c) strategies of interconnecting Grids.